Since the debut of "Stranger Things 2," inappropriate discussions about the young cast have sparked controversy.

Fans have been accused of sexualizing the young stars, including Millie Bobby Brown (Eleven) and Finn Wolfhard (Mike).

Former child star Mara Wilson ("Matilda," "Mrs. Doubtfire") wrote a new op-ed.

"A 13-year-old girl is not all grown up," Wilson writes. "And even if she had been what we consider grown up, that is not newsworthy."

Wilson also says the media has an important role to play when it comes to "the creepy, inappropriate public inclination to sexualize young girls."

Fans of the young cast of "Stranger Things" have been the subject of an ongoing controversy over fans' inappropriate behavior towards the child stars — and now celebrities are weighing in.

After photos of Millie Bobby Brown (Eleven) at the "Stranger Things 2" premiere were released, one viral tweet commenting on her appearance struck a nerve. Mike Sington, a retired NBC executive, shared photos of Brown on the red carpet and captioned them: "Millie Bobby Brown just grew up in front of our eyes. (She's 13!)"

The tweet gained traction and was criticized for inaccurately and inappropriately describing Brown as "grown up." Then former child star and "Matilda" actress Mara Wilson retweeted Sington's comment, saying, "Knock it the f--- off."

Two days later, Sington released a statement on Twitter in regards to the tweet about Brown.

Here's part of Sington's statement:

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Looking back, I can see how some could interpret commenting on the grown up look of a child as contributing to the objectification or even sexualization of a minor, and I appreciate those of you that brought this to my attention. That was never my intent, and I sincerely regret if anyone thought it was.

Wilson writes new op-ed speaking out

The conversation has continued beyond last week, with more people coming out against the sexualization of the young "Stranger Things" stars. Wilson has now followed up on her tweets with an op-ed in Elle Magazine.

"I felt sick, and then I felt furious," Wilson wrote in regards to seeing Sington's tweet. "A 13-year-old girl is not all grown up. And even if she had been what we consider grown up, that is not newsworthy."

Wilson detailed her own accounts of being sexualized by adult fans when she was young, including recieving inappropriate letters from male fans or being Photoshopped into child pornography.

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She emphasized the important role the current digital climate and media have when it comes to putting young actors at risk.

"What's really at play here is the creepy, inappropriate public inclination to sexualize young girls in the media," Wilson writes. "We do not need to perpetuate the culture of dehumanization Hollywood has enabled."

Fans' treatment of Finn Wolfhard has also been the subject of controversy

Wilson isn't the only celebrity who has stepped forward in recent weeks to defend the young "Stranger Things" cast against misbehaving or abusive fans.

"They are kids first," Turner wrote. "Give them the space they need in order to grow without feeling like they owe anyone anything for living their childhood dreams."

Here's a longer section of Turner's statement on the treatment of the young stars:

Imagine you, a parent, walking with your 13 year old son/daughter and seeing a fully grown adult pointing their camera phone at your kid. You would do anything you could to delete that person's photograph, and remove your child from that situation as soon as you could.

Though Turner's comments weren't directly about the sexualization of Wolfhard, he had also been the subject of conversations about inappropriate comments made by adults.

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A 27-year-old model, Ali Micheal, came under scrutiny after she posted an Instagram story that included a photo of 14-year-old Wolfhard and text saying: "Not to be weird but hit me up in few years."

"I don't wanna ex-communicate anyone from this fandom, but if you are for real you will not harass my friends, or co-workers," Wolfhard wrote. "Ya'll know who you are."

Hopefully the added attention from stars like Mara Wilson and Sophie Turner will help quell future inappropriate conversations over the young "Stranger Things" cast and their physical appearances as they continue starring in Netflix's hit series.

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